Asaphida

Paradionide anmenensis

Order Asaphida / Superfamily Trinucleoidea / Family Dionididae

Darriwilian (Middle Ordovician)Gansu

Paradionide anmenensis — photo 1 — Photo 1 · Holotype 10128 (Gansu; Zhang Wentang et al. 1960) Cephalon specimen (Gansu; Zhang Wentang et al. 1960)

Paradionide anmenensis — photo 2 — Photo 2 · Holotype 10128 (Gansu; Zhang Wentang et al. 1960) Cephalon specimen (Gansu; Zhang Wentang et al. 1960)

Classification

Order Asaphida / Superfamily Trinucleoidea / Family Dionididae

Genus

Paradionide Chang & Fan, 1960

Genus author

Zhang Wentang, Fan Jiasong

Genus etymology

para, Greek, near, beside, similar to; Dionide, a trilobite genus name

Species

P. anmenensis Chang & Fan, 1960

Species author

Zhang Wentang, Fan Jiasong

Species etymology

Anmen, south of Anmen within Kulongshan Pass, Yumen City, Gansu, the locality

Age

Darriwilian (Middle Ordovician)

Distribution

Gansu

Synonyms

Dionide (Paradionide) anmenensis

Diagnosis

Dorsal shield rather flat, circular. Cephalon crescentic, transversely extremely wide; glabella small, subsquare, with deep posterior longitudinal furrows; preglabellar field longitudinally extremely long; occipital furrow faint; occipital ring longitudinally short; genal lobes with radiating ornament; genal ridges distinct. Thorax of 6 or 9 segments; axis narrow, each axial ring with a pair of anterior lateral lobes and a median lobe; pleural lobes wide and flat, pleurae horizontal, pleural furrows narrow and shallow. Pygidium flat, sub- semicircular; axis with more than 12 rings; pleural and interpleural furrows numerous and distinct.

Remarks

This species is the type species of the genus Paradionide.